[Freeswitch-users] Event-List: double Content-Lenght?

[Anthony Minessale]

this is an encapsulated event inside a container event.

if you were framing this on the wire you would read the headers
(everything up to the gap)
the content-length of 625 tells you to read exactly that many bytes
and content type text/event-plain

now when you read 625 bytes you can continue to read on the wire for a
new event.
Meanwhile you url decode that payload and you have another event who
also has a payload of 41 bytes.
Now you can read these 41 bytes to get the payload which is the exact
size of the message contained in the event.

None of this matters to you if you use the ESL lib supplied with FS to
read events into a scripting language.



On Tue, Mar 22, 2011 at 6:45 AM, Iñaki Baz Castillo <ibc at aliax.net> wrote:
> Hi, I'm trying to understand the following example in the doc:
>
>  http://wiki.freeswitch.org/wiki/Event_List
>
> Upon job completion, server response
> ----------------------
> Content-Length: 625
> Content-Type: text/event-plain
>
> Job-UUID: 7f4db78a-17d7-11dd-b7a0-db4edd065621
> Job-Command: originate
> Job-Command-Arg: sofia/default/1005%20'%26park'
> Event-Name: BACKGROUND_JOB
> Core-UUID: 42bdf272-16e6-11dd-b7a0-db4edd065621
> FreeSWITCH-Hostname: ser
> FreeSWITCH-IPv4: 192.168.1.104
> FreeSWITCH-IPv6: 127.0.0.1
> Event-Date-Local: 2008-05-02%2007%3A37%3A03
> Event-Date-GMT: Thu,%2001%20May%202008%2023%3A37%3A03%20GMT
> Event-Date-timestamp: 1209685023894968
> Event-Calling-File: mod_event_socket.c
> Event-Calling-Function: api_exec
> Event-Calling-Line-Number: 609
> Content-Length: 41
>
> +OK 7f4de4bc-17d7-11dd-b7a0-db4edd065621
> ----------------------
>
>
> What is the purpose of the first "Content-Length: 625"? Why not just
> send all the headers with no Content-Lenght? (just leave the second
> Content-Length:41 which is the length of the job uuid).
>
> So what is the purpose of the first Content-Length? A parser doesn't
> need it at all as it can read headers until it finds "Content-Length"
> (so it reads N bytes more) or it finds a double \n\n (so event info is
> terminated).
>
> Thanks for any clarification.
>
>
> --
> Iñaki Baz Castillo
> <ibc at aliax.net>
>
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-- 
Anthony Minessale II

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